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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Riddle me this? Ballistic calc vs reality mismatch...
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<blockquote data-quote="entoptics" data-source="post: 1980417" data-attributes="member: 104268"><p>Ranges were taken with a Vortex Fury 5000, within half a yard from end of muzzle.</p><p></p><p>Top pic above shows the zero group (1/8 MOA high and left), fired right before 503 yd group, and all shots went past a LabRadar, so I don't see how velocity or zero can be the issue...</p><p></p><p>3 Different ballistics programs agreed on ~6.8 ± 0.15 MOA with following inputs...</p><p></p><p>0.7 G1 BC</p><p>27.56 inHg uncorrected pressure</p><p>70° F</p><p>40% humidity</p><p>1.8" Sight over bore</p><p></p><p>As mentioned above, I'd need 0.85 plus G1 (0.5 G7) to get the group down to the bullseye.</p><p></p><p>Playing around with pressure/temp, and my measurements would have had to be off the equivalent of 8000 ft elevation gain, and I think I would have noticed if it was 150° F...</p><p></p><p>I'm used to some variation from reality to software, particularly at >>500 yds, but 3/4 MOA at 500 is perplexing.</p><p></p><p>Seems like it has to be in the scope (despite box test results), so I'll revisit that when I get the chance.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1980417, member: 104268"] Ranges were taken with a Vortex Fury 5000, within half a yard from end of muzzle. Top pic above shows the zero group (1/8 MOA high and left), fired right before 503 yd group, and all shots went past a LabRadar, so I don't see how velocity or zero can be the issue... 3 Different ballistics programs agreed on ~6.8 ± 0.15 MOA with following inputs... 0.7 G1 BC 27.56 inHg uncorrected pressure 70° F 40% humidity 1.8" Sight over bore As mentioned above, I'd need 0.85 plus G1 (0.5 G7) to get the group down to the bullseye. Playing around with pressure/temp, and my measurements would have had to be off the equivalent of 8000 ft elevation gain, and I think I would have noticed if it was 150° F... I'm used to some variation from reality to software, particularly at >>500 yds, but 3/4 MOA at 500 is perplexing. Seems like it has to be in the scope (despite box test results), so I'll revisit that when I get the chance. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Riddle me this? Ballistic calc vs reality mismatch...
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